Packera tridenticulata (Rydb.) W.A. Weber & Á. Löve

vernacular threetooth ragwort — species · Asteraceae

USDA: PATR7
GBIF: 4248947 syn.
Rank: species

threetooth ragwort (Packera tridenticulata) — Platephotograph · Trevor SchullerCC BY-NC source · iNaturalist ↗

§2Habit & range

Growth habit: Forb/herb, Subshrub
Duration: Perennial
Group: Dicot
Family: Asteraceae Bercht. & J. Presl
Genus: Packera

§2a

Native status, by region

CAN Canada Native
L48 Lower 48 States Native

§2b

County-level range

· 1 county across 1 state

Legend Native · 1 Introduced · 0 Both · 0 Hover a county for detail.

§3Cultivation specs · USDA

Recorded by the USDA Plant Materials Program.

§3a

Tolerances

Drought: Medium
Shade: High
Moisture use: Medium
Fire: High
Salinity: None
Anaerobic: Medium
CaCO₃: Low
Hedging: None

§3b

Climate & soil

Cold tolerance: -23 °F minimum
Frost-free days: 100 min.
Precipitation: 22–45 in/yr
pH range: 5–7.5
Root depth: 12 in min.
Fertility need: Medium
Soil texture: coarse, medium, fine

§3c

Form & growth

Growth form: Multiple Stem
Growth rate: Moderate
Lifespan: Short
Mature height: 3 ft
Foliage texture: Fine
Foliage colour: Green
Porosity (summer): Porous
Porosity (winter): Porous
Flower colour: Yellow
Fruit colour: Brown
Fire resistant: No
N fixation: None
Toxicity: None

§3d

Reproduction

Bloom period: Late Summer
Seed abundance: Medium
Seed begins: Spring
Seed ends: Summer
Spread rate: Moderate
Stratify: No
Seeds / lb: 500,000
Propagation: seed, bare root

§3e

Use & availability

Commercial availability: No Known Source
Nursery stock: No
Browse palatability: Medium
Graze palatability: Low
Palatable, human: No
Protein potential: Low
Lumber: No
Christmas tree: No

§4Counties, by state

Recorded in 1 county across 1 state.

Montana view state ↗ 1 N ▾

Teton 30099

§5Sources & provenance

USDA PLANTS

Symbol, taxonomy, distribution, cultivation specs, native status. Public domain.

plants.usda.gov/PATR7 ↗

GBIF Backbone

Canonical taxonomic identity, synonym resolution, cross-refs. CC0.

gbif.org/species/4248947 ↗

Record version

Cached and built locally. Source version on this record:

usda-plants-mt-2026-05-25

fetched 2026-05-25T18:27:19Z